I would leave him alone. Feed him with small bits of fish, erase size, 1-2 pieces every 3-7 days. He wil get better and will move on his own when the time come.
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He's actually migrating downward albeit slowly. The sand is only a couple of inches below the base of the foot. He must like the flow/light in that general area. Here's a photo from last year. That's almost foot higher than today.I would leave him alone. Feed him with small bits of fish, erase size, 1-2 pieces every 3-7 days. He wil get better and will move on his own when the time come.